LC78855 Ver la hoja de datos (PDF) - SANYO -> Panasonic

Número de pieza

componentes Descripción

Fabricante

LC78855

Digital Audio D/A Converter with Built-in Digital Filters

SANYO -> Panasonic 

LC78855KM

Pin Functions

Pin No.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

Function

RESETB

CNT1

CNT2

CNT3

BCLK

LRCK

DATA

MODE

CLKOUT

XVDD

XIN

XOUT

XGND

DGND

MUTERO

TEST

AVDD4

OUTRA

AGND2

OUTRB

AVDD3

AVDD2

OUTLB

AGND1

OUTLA

AVDD1

MUTELO

DVDD

Description

Reset input (Internal circuits are initialized when a low level is input to this pin.)

When MODE = low: Control data shift clock

When MODE = high: Emphasis on/off switch

When MODE = low: Control data latch signal input

When MODE = high: Standard speed/double speed switch

When MODE = low: Control data input

When MODE = high: Soft muting input

Bit clock input

LR clock input

Digital audio data input

Serial/parallel input setting

Clock output

Oscillator amplifier power supply

Oscillator amplifier input

Oscillator amplifier output

Oscillator amplifier ground

Digital system ground

Right channel muting signal output

Test pin (Must be tied low in normal operation.)

Analog system power supply

Right channel output A

Analog system ground

Right channel output B

Analog system ground

Analog system ground

Left channel output B

Analog system ground

Left channel output A

Analog system ground

Left channel muting signal output

Digital system power supply

LC78855KM Operation

The LC78855KM consists of two major sections; a digital filter block and a D/A converter.

1. Digital Filter Block

• Standard speed operation

The LC78855KM implements 8× oversampling using three filters: a 43rd order FIR filter, an 11th order FIR filter

and a third order FIR filter. De-emphasis is performed using a first order IIR filter.

• Double speed operation

This mode is used, for example, for dubbing a CD to a cassette at double speed. The XIN pin functions in the same

manner as in standard mode, but the BCLK, LRCK and DATA signals are input at twice the speed. After de-

emphasis is performed with a first order IIR filter 4× oversampling is performed using two filters: a 43rd order FIR

filter and a third order FIR filter.

No. 4999-4/9

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